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Hajj to Mecca

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Muslim pilgrims gather on the Plain of Arafat, outside Mecca, Saudi Arabia, on Nov. 15. The Hajj pilgrimage draws 2.5 million visitors each year, making it the largest annual gathering of people in the world. Mohammed Salem/Reuters

A Muslim pilgrim looks out of a bus window on the Plain of Arafat, outside Mecca, Saudi Arabia, on Nov. 15. Mohammed Salem/Reuters

Thousands of tents housing Muslim pilgrims are crowded together in Mina near Mecca, Saudi Arabia, on Nov. 14. Hassan Ammar/AP